Superconducting Transition of Tin Alloys in an Alternating Field

Park, J. G.

doi:10.1103/revmodphys.36.87

Cited by 26 publications

(5 citation statements)

References 1 publication

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“…The time evolution of the obtained ordinary differential equations was found by the forward Euler method. The vortex velocity V as a function of ∂H/∂x is approximated by the following expression V = 0, if |∂H/∂x| < F p and (7) for |∂H/∂x| > F p .…”

Section: Discussionmentioning

confidence: 99%

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AC conductivity of a niobium thin film in a swept magnetic field

Tsindlekht

Genkin

Gaži

et al. 2013

J. Phys.: Condens. Matter

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We report the results of the measurement the ac conductivity of a Nb superconducting thin film in a swept dc magnetic field. In the mixed state the swept dc field creates vortices at the film surface which pass through the film and form the observed ac conductivity. Vortex rate generation does not depend on the value of the dc field and there is a large plateau-like region of dc magnetic fields where the dissipation is approximately constant. A proposed phenomenological model describes quite well the main features of the ac response in these fields including its dependency on the sweep rate, ac amplitude, frequency, and value of the second and third harmonics.

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Section: Discussionmentioning

confidence: 99%

“…The phenomenological switching model [2,3,5,6] supposes that if q < 1 the instantaneous time rate of the field changes its sign for a fraction of each ac period. During this interval the vortices become pinned and the sample is lossless [7]. During the remainder of the period the loss mechanism should operate.…”

Section: Introductionmentioning

confidence: 99%

AC conductivity of a niobium thin film in a swept magnetic field

Tsindlekht

Genkin

Gaži

et al. 2013

J. Phys.: Condens. Matter

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“…According to equation (6), the inverse logarithmic derivative of resistivity is linearly proportional to the temperature of measurement. Figure 7 shows that the resistivity in the temperature range * < < T T T g is well described by equation (6). In figure 7, the slope of the straight line fitted to the experimental data (within the temperature range * < < T T T g ) gives the value of the critical exponent and its intercept on the temperature axis gives the value of the glass transition temperature T g .…”

Section: Resultsmentioning

confidence: 85%

“…With the discovery of surface superconductivity, it was possible to explain a large amount of experimental data, which had previously been discarded as due to the sample inhomogeneity [5]. Later, many researchers studied the surface superconducting state in many superconductors such as -Pb-Tl, Nb, MgB 2 [6,7,8,9,10,11,12]. Initially it was thought that for surface superconductivity (and surface critical current) to exist, the local magnetic field needs to be parallel to the sample surface [7,13,14,15,16].…”

Section: Introductionmentioning

confidence: 99%

Vortex–glass transformation within the surface superconducting state ofβ-phase Mo_1-xRe_xalloys

Sundar

Chattopadhyay

Chandra

et al. 2016

Supercond. Sci. Technol.

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Abstract.We have performed an experimental study on the temperature dependence of electrical resistivity ρ(T ) and heat capacity C(T ) of the Mo 1−x Re x (x = 0.20, 0.25) alloy superconductors in different magnetic fields. In the presence of applied magnetic field, the electrical resistivity of these alloys go to zero at a temperature well above the bulk superconducting transition temperature obtained with the help of heat capacity measurements in the same magnetic field. Our study indicates the presence of surface superconducting state in these alloys, where the flux lines are pinned in the surface sheath of the superconductor. The configuration of the flux-lines (2d pancake-like) in the surface sheath is understood in the realm of the flux-spot model. Experimental evidence in support of the surface mixed-state state or "Kulik vortex-state" and the occurrence of a vortex-liquid to vortex-glass transition is presented.

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“…Its magnitude may then be determined by magnetization measurements on cylinders. [10][11][12][13][14] The surface sheath shows hysteresis similar to that of a thin cylindrical film. This means that it is possible to define a fluxoid quantum number, which is constant, except when the current is critical.…”

Section: Introductionmentioning

confidence: 96%

Ginzburg-Landau Theory of Surface Superconductivity and Magnetic Hysteresis

Christiansen

Smith

1968

Phys. Rev.

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The magnetization properties of a long superconducting cylinder with an ideal surface and a radius much larger than the low-field penetration depth are discussed on the basis of numerical solutions to the onedimensional Ginzburg-Landau equations for a half-space. The current-carrying properties of the complete set of nodeless surface solutions and Meissner solutions are discussed in detail, and a separate numerical investigation of infinitesimal solutions is included. A stability criterion is derived, and infinitesimal solutions are shown to be unstable below # c3 . Finally these results are used for determining critical currents and magnetization curves. It is shown that there is a new kind of superheating and supercooling due to the shielding properties of the surface sheath. 445 446 P. V. CHRISTIANSEN AND H. SMITH

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Superconducting Transition of Tin Alloys in an Alternating Field

Cited by 26 publications

References 1 publication

AC conductivity of a niobium thin film in a swept magnetic field

AC conductivity of a niobium thin film in a swept magnetic field

Vortex–glass transformation within the surface superconducting state ofβ-phase Mo_1-xRe_xalloys

Ginzburg-Landau Theory of Surface Superconductivity and Magnetic Hysteresis

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Superconducting Transition of Tin Alloys in an Alternating Field

Cited by 26 publications

References 1 publication

AC conductivity of a niobium thin film in a swept magnetic field

AC conductivity of a niobium thin film in a swept magnetic field

Vortex–glass transformation within the surface superconducting state ofβ-phase Mo1-xRexalloys

Ginzburg-Landau Theory of Surface Superconductivity and Magnetic Hysteresis

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Product

Resources

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Vortex–glass transformation within the surface superconducting state ofβ-phase Mo_1-xRe_xalloys